What is stable, experimental, or planned — and the compatibility policy.

Capabilities

DemiEngine is alpha/beta. This page is the honest support matrix — do not infer production support from an example alone.

Stable

• Versioned JSON projects, scenes, prefabs, HUD trees, assets, data, and saves
• Lua lifecycle scripts, explicit service imports, editor property annotations, events, timers, hot reload, modular LuaLS stubs
• Contextual input actions for keyboard, mouse, gamepads, touch, gestures, and virtual controls; deterministic input replay
• 2D rendering: sprites, cameras, animation, tilemaps, materials, startup-loaded game shaders, particles, masks, nine-slice, debug overlays
• Box2D physics: multiple collider shapes, contacts, queries, joints, CCD, kinematic movement, matching debug drawing
• 2D navigation and reusable controllers
• Retained tree UI: anchors, layout containers, focus/navigation, themes, localization, UI prefabs, text editing, virtualization, accessibility snapshots
• Schema-backed immutable game data
• Audio mixing, buses, snapshots, scheduling, streaming, spatial voices, entity-attached sources
• Deterministic asset importing, dependency validation, portable .demipack archives, locked .demipkg packages, cooking
• Linux cooking/packaging and runtime bundles
• Profiling, CSV reports, deterministic replay, headless smoke tests, capability gates
• Shared component metadata driving serialization and Inspector

Experimental

• Lightweight 3D: glTF models and skeletal clips, Vulkan GPU skinning with CPU fallback, instancing, culling, model/visual animation LOD, crowd probes
• Jolt rigid bodies, compound colliders, spatial queries, character movement, collider assets, collider generation from models
• Component-based fracture authoring and native Blast/Jolt impacts, masonry, proximity activation, debris cleanup, destruction checkpoints
• Mesh denting, height-map surface relief, textured materials, local and directional lights, tone-mapped panorama skies, mipmaps, particles, post effects
• Native editor with scene/HUD/prefab stages, hierarchy, Inspector, Undo/Redo, embedded Play, asset folders, diagnostics, profiling
• Host-authoritative networking with contracts, ownership, late-join state, reconnect primitives, dedicated server
• Async HTTP/HTTPS with verified TLS
• Android APK/AAB build and signing (feature and device qualification stays scoped)
• Video and cutscene playback on media-enabled builds
• Production text/dynamic UI and the 3D animation adapter

Planned

• Android cooking integration
• Professional desktop 3D expansion (HDR/PBR/reflections, large-world workflows, structural stress)
• Broader production qualification across devices

Platform notes

Compatibility policy

• During alpha/beta, breaking changes are allowed without deprecation. Examples, templates, packages, schemas, stubs, tests, and docs migrate in the same change.
• Breaking changes keep one current way to do each job; examples, templates, packages, schemas, stubs, tests, and docs migrate with the change.
• Every durable document keeps format_version. Unsupported versions are rejected with clear diagnostics.
• Unknown components are errors unless registered extensions own them.
• Saves are never silently deleted; incompatible saves keep clear diagnostics and migrations where possible.
• Compatibility guarantees begin with the first explicitly designated production release.

Measure, do not assume

Benchmark reports record specific runs (hardware, resolution, build configuration, workload). They do not establish a general capacity guarantee for every scene or device. Use demi run --profiler and the qualification examples for comparable numbers.

Found an issue or missing topic? The full engine sources and markdown notes live in the DemiEngine repository.